ON TBS METALS OF THB ALKALI!*.^ 5^ 



{. .-r 



about 17 grains, indicatinjj 9*2 grains of lime. 



From the preceding analysis, which was repeated no lesi 

 than three times, a diftVrent method being employed in 

 each, the constituents of allanite are as follows : 



Silica ••.... 35'4 



Lime 9-2 ^7.7:1 



Alumina • 4*1 nite. 



Oxide of iron • • • • • • 25*4 



Oxide of cerium 33*9 



Volatile matter •••• 4* 



112-0 



1 omit the 7 grains of junonium, because I only detected it 

 tn one specimen of allanite. The excess of weight in the 

 preceding numbers is to be ascribed chiefly to the carbonic 

 acid combined with the oxide of cerium, from which it was 

 not completely freed by a red heat. I have reason to be- 

 lieve, too, that the proportion of iron is not quite so much as J^^, ^^^"^ P**" 



r> ' , . , . , bably over- 



25*5 grains. For, in another analysis, I obtained only 18 rated. 



grains, and in a third 20 grains. Some of the cerium was 

 perhaps precipitated along with ii in the preceding analysis, 

 and thus its weight was apparently increased. 



IX. 



Observations on Thre€ Papers of Mr. Davy. By Messrs. 

 Gay-Lussac ajtd Thekard*. 



In the Annales de Chimie for September last are transla- ^ -^ , 

 tions of three papers by Mr. Davy, sent to France by that observatjon* 

 gentleman, and entitled, 1. Observations on the Researches °^ ^^if '^^f 

 of Messrs. Gay-Lussac and Thenard relative to the Amal- Gay-Lussac 

 gam furnished by ammonia. 2* Examination of some and Thenard 

 Observations of Messrs. Gay>Lussac and Thenard on the 

 Facts respecting the Metals of the Alkalis. 3. Reply to 



♦ Abridged from ihe Aiuial. de China, vol. LXXV, p. 290. 



Messrs. 



